1.

25. Arithmetic Mean of the following data is 25.4.X=10-20. Frequency= 20 20-30. 15 30-40. y 40-50. 3 50-60. 2Find the missing frequency Y.​

Answer»

Answer:

ANSWER

class F cf

0-10 10 10

10-20 x 10+x

20-30 25 35+x

30-40 30 65+x

40-50 y 65+x+y

50-60 10 75+x+y

75+x+y

75+x+y=100

x+y=25

f=30,h=10,cf=35+x,

2

n

=50

Median=l+(

f

2

n

−cf

)×h

32=(

30

50−35−x

)×10

32−30=

3

15−x

6=15−x

x=9

∴y=16


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